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Bivalvia - Trigoniida
It was corrected as Trigoniida by Carter et al. (2011).
It was assigned to Bivalvia by Sepkoski (2002); to Palaeoheterodonta by Vokes (1980), Giribet and Wheeler (2002) and Bieler and Mikkelsen (2006); to Heteroconchia by Scholz et al. (2008); and to Unionata by Carter et al. (2011).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.